code: def downgrade():
      pass
  
file_path: superset/superset/migrations/versions/2022-07-05_15-48_409c7b420ab0_add_created_by_fk_as_owner.py
imports: from alembic import op
  from sqlalchemy import and_, Column, insert, Integer
  from sqlalchemy.ext.declarative import declarative_base
  from superset import db
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types